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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5cc74fdfcb9249984f3a5ca421b8cffe5ea94c2908ed1f094c3c8885cfbbb6' 
  AND token = '7Y0GwrIuHNhzZby/RrrapE+moppSS0kzzcuH++hFcJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}